/// <summary>
/// Initializes an instance of the PRNG using the seed provided and cipher and entropy source groups chosen
/// </summary>
/// <param name="seedStream">stream containing seed information</param>
/// <param name="cipher">cipher to use</param>
/// <param name="sourceGroup">local, remote or both</param>
/// <returns>initialised PRNG</returns>
public static IRNGVenturaProvider Create(Stream seedStream, Cipher cipher, ReseedEntropySourceGroup sourceGroup)
{
var extractors = new List <IEntropyExtractor>();
switch (sourceGroup)
{
case ReseedEntropySourceGroup.Local:
extractors.Add(new GarbageCollectorExtractor(new EventEmitter(0)));
extractors.Add(new AppDomainExtractor(new EventEmitter(1)));
extractors.Add(new ProcessEntropyExtractor(new EventEmitter(2)));
extractors.Add(new SystemUtcExtractor(new EventEmitter(3)));
break;
case ReseedEntropySourceGroup.Remote:
extractors.Add(new AtmosphericNoiseExtractor(new EventEmitter(0)));
extractors.Add(new HotBitsExtractor(new EventEmitter(1)));
extractors.Add(new WeatherEntropyExtractor(new EventEmitter(2)));
break;
case ReseedEntropySourceGroup.Full:
extractors.Add(new GarbageCollectorExtractor(new EventEmitter(0)));
extractors.Add(new AppDomainExtractor(new EventEmitter(1)));
extractors.Add(new ProcessEntropyExtractor(new EventEmitter(2)));
extractors.Add(new SystemUtcExtractor(new EventEmitter(3)));
extractors.Add(new AtmosphericNoiseExtractor(new EventEmitter(4)));
extractors.Add(new HotBitsExtractor(new EventEmitter(5)));
extractors.Add(new WeatherEntropyExtractor(new EventEmitter(6)));
break;
default:
throw new ArgumentOutOfRangeException(nameof(sourceGroup), sourceGroup, null);
}
return(new RNGVenturaProvider(new VenturaAccumulator(extractors), new VenturaGenerator(cipher), seedStream));
}
/// <summary>
/// Initializes an instance of the PRNG and seeds it with a pseudorandomly
/// picked remote entropy source. A MemoryStream is used to store
/// the seed which is discarded on exit.
/// </summary>
/// <param name="cipher">cipher to use</param>
/// <param name="sourceGroup">local or remote</param>
/// <returns>initialised PRNG</returns>
public static IRNGVenturaProvider CreateSeeded(Cipher cipher, ReseedEntropySourceGroup sourceGroup)
{
var extractors = new List <IEntropyExtractor>()
{
new WeatherEntropyExtractor(new EventEmitter(0)),
new AtmosphericNoiseExtractor(new EventEmitter(1)),
new HotBitsExtractor(new EventEmitter(2))
};
byte[] seed = new SeedProvider(extractors).GetBytes();
return(Create(Convert(seed), cipher, sourceGroup));
}
/// <summary>
///
/// </summary>
/// <param name="seedStream"></param>
/// <param name="cipher"></param>
/// <param name="sourceGroup"></param>
/// <returns></returns>
public static RandomNumberGenerator CreateRng(Stream seedStream, Cipher cipher, ReseedEntropySourceGroup sourceGroup)
{
return((RandomNumberGenerator)Create(seedStream, cipher, sourceGroup));
}
